Base for electric incandescent lamps.



' P. .G. TRIQUET- BASE FOR ELECTRIC INUANDESCENT LAMPS.

APPLIOATION FILED JULY 28, 1910.

Patefited June 10,1913.

W ggg g%%w/fiya zi 'PAU'L GABRIEL 'rnroun'r, or ranrsrnrxnon.

BASE son ELECTRIC rucaunnscnur LAMPS.

Specification of Letters Patent.

Patented June 10, 1913.

klipfication enem 28,1910. seri'arms'zissr.

1 all whom it may concern."

Be it known that I, PAUL GABRIEL TRI- UET,'a citizen of the French Republic, and! resident of Paris, France, have invented certain new and useful Improvements in Bases for Electric Incandescent Lamps, of

whifih the following is a specification.

This invention relates to electric incan- 1 descent lamps and more especially to screw .i'dfthreaded bases for. these lamps the object being to provide a lamp base of this kind which is provided with an insulating metallic collar .intended 'to prevent the hand of the person manipulating the lamp from coming into contact with one 'of the poles of'the clrcuit.

In the accompanying drawings: Figure l is' a longitudinal section of the lamp base constructed according to the principles of the present invention; Fig. 2 1s a similar section of a somewhat modlfied form of lamp base, provided with an inner smooth neck. Fig. 3 shows a similar section of another modification, wherein noinsulating sleeve, made beforehand, has been employed. Fig. 4 is a longitudinal section of still another form of embodiment of lamp base wherein the current inlet wire has been connected in somewhat modified manner.

This lamp base comprises a body A which is provided with a collar B which is left free when the lamp base has been screwed into its socket and with which the hand of the operator may come into contact. The neck C of the body A of the lamp base has been provided with screw threads having the same pitch as those of anordinary lamp base but a slightly smaller diameter.

Screwed with a tight grip on the'neck C is an insulating sleeve D made of fiber, paper, card board, leather card board, asbestos card board or any other suitable mate-- rial, this sleeve being also provided with screw threads having the same pitch as the usual screw threads ofthe lamp bases and prm 'ided with an outer spread out edge cl. Screwed on this insulating sleeve D is the base sleeve or base proper E which carries the bottom contact F of the lamp this bot tom contact being insulated by the usual means and receiving one of the conducting wires 8 of the lamp filament. The spread out edge (Z of the insulating sleeve D prevents as readily seen any tantact between the collar B and the lower edge of the sleeve E.

Tosum up andto characterize the invention with a few words, a lamp base provided with a collar B is screwed intb an ordinary base or. contact sleeve E and the two parts are separated from each other by an insut lating furrow D which exactly follows the screw threads of said bases.

The conducting wire 9 connecting thec'ontact sleeve E with the filament passes through the cap of insulating material 'G between the bottom contact F and the me tallic partof .the contact sleeve E to which it is soldered. As shown by Fig. 4 this connection between the wire 9 and the contact sleeve E may be carried out in a somewhat modified manner. Here the part cl has been provided laterally with a rather large opening through which passes the con ducting wire 9. The latter is held in position by the insulating material l which is provided with a smaller hole 0 and is finally soldered to the contact sleeve E. As readily seen owing to the hole is being sufiiciently large, the wire 9 cannot come into contact with the part C of the base.

The sleeve or furrow D may be coated with 'an insulating glue which holds the whole firmly together.

As shown by Fig. 2 the neck C of the body A may also besmooth and cylindrical and the sleeve D made of paper, fiber, or any other suitable mate-nah; may-be coated with glue 4, secotinefccment, shellac and the like for ascertaining the perfect adherence between the parts (l and D. The insulatmg sleeve D may even be replaced by a furrow 13 of plaster, cement, shellac, and the like (Fig. 3) which then ascertains by. itself the direct adherence between the parts C and E.

A lamp provided witha base constructed according to the present invention is employed in the same manner as an ordinary one. I However as the contact sleeve E which is intended to come into contactwith one of the poles of the supply circuit is completely insulated from the collar B of the base, one I I may safely grasp the latter for screwing the lamp base into its socket without any danger of receiving a kick from the supply circuit.

Having now fully described my said invention what I claim and desire to secure by Letters Patent, is

1. An incandescent lamp comprising a body, a base collar provided with a metallic neck attached to the body, a cap of insulating material, a metallic contact in said cap,

u metallic base sleeve having screw threglds surrounding the neck, and attached to the cap, 311 i -'-ulating sleeve interpcsed between the neck and the base sleeve and means for 5 connecting the filsment of the lamp to the contact ii the cap a ndibase s1eeve.

2. A base for ma mas-se t lamps c0mp1 is'-.

1 iiig in combinaticzifwith"the-base body; a

collar having a screw thl eadjed sleeve liaede of insulating material e idilhsving a spread out-edge screwed en neck, and all base contact. sleeve screwed-f 4531- said} insulating sleeve, substantisiiyaskaiid for the purpose set-forth. Q 5 3.. A base for incendescen1ampscom7prising in combination with a base body a cellar having a screw threaded neck a screw threaded sleeve made of insulating metenal e and having a spread out edge and screwed;

in said neck, a base contact sleeve screwed- In testimony'whefimf I have hereunto set 25-j.

my hand .in presenceof two witnesses.

. PAUL GABRIEL TRIQUET -lfifitnesses V *JbsEi'H'RoB RT IPPUT, 

